// All imports are dynamic — loaded AFTER ensureNativeBinary() completes
// ES modules evaluate ALL static imports before executing any code,
// so we cannot have any static imports that transitively load matrix-bot-sdk

// Type-only import — erased at compile time, no runtime effect
import type { MatrixEventContext } from "./matrix-client.js"

// =============================================================================
// Plugin data directory
// =============================================================================

function ensureDataDir(dir: string): void {
  const fs = require("fs")
  if (!fs.existsSync(dir)) {
    fs.mkdirSync(dir, { recursive: true })
  }
}

// =============================================================================
// Global mutex
// =============================================================================

let LOCK_FILE = ""

function tryAcquireLock(): boolean {
  const fs = require("fs")
  try {
    if (fs.existsSync(LOCK_FILE)) {
      const existingPid = parseInt(fs.readFileSync(LOCK_FILE, "utf-8").trim(), 10)
      if (existingPid && existingPid !== process.pid) {
        try {
          process.kill(existingPid, 0)
        } catch {
          fs.unlinkSync(LOCK_FILE)
        }
      } else if (existingPid === process.pid) {
        return false
      } else {
        return false
      }
    }
    fs.writeFileSync(LOCK_FILE, String(process.pid), { mode: 0o644 })
    return true
  } catch {
    return false
  }
}

function releaseLock(): void {
  const fs = require("fs")
  try {
    fs.unlinkSync(LOCK_FILE)
  } catch {
    // ignore
  }
}

// =============================================================================
// Plugin Setup
// =============================================================================

async function runPlugin(
  ctx: any,
  options: any,
  dataDir: string,
  log: (msg: string) => void,
  logError: (msg: string) => void,
) {
  // Dynamic imports — loaded AFTER ensureNativeBinary() completes
  const { MatrixBotClient } = await import("./matrix-client.js")
  const { SessionManager } = await import("./session-manager.js")
  const { loadConfig } = await import("./config-loader.js")

  ensureDataDir(dataDir)
  LOCK_FILE = `${dataDir}/lock`

  const directory = ctx?.location?.directory || process.cwd()
  log(`Plugin setup started, directory=${directory}`)

  // Acquire global lock
  const locked = tryAcquireLock()
  if (!locked) {
    log("Another instance already running (lock held), skipping bot startup")
    return () => {}
  }

  const eventController = new AbortController()
  let cleanup: (() => void) | undefined

  try {
    log(`Configuration loaded`)

    if (!options.homeserver) {
      log("Plugin disabled (no homeserver configured)")
      return () => {}
    }

    log(`Configuration loaded`)

    const matrix = new MatrixBotClient(options)
    const sessionManager = new SessionManager(options.rateLimitSeconds || 5)

    // Track Matrix context per OpenCode session
    const sessionContextMap = new Map<string, { roomId: string; threadRootId: string; context: any }>()

    // =============================================================================
    // Pending prompt responses
    // =============================================================================

    const pendingResponses = new Map<string, {
      resolve: (text: string) => void
      reject: (err: any) => void
    }>()

    // =============================================================================
    // Step tracking
    // =============================================================================

    interface ToolCall {
      toolID: string
      name: string
      args: string
      result: string
      failed: boolean
    }

    interface StepData {
      assistantMessageID: string
      reasoning: string
      tools: ToolCall[]
      text: string
    }

    interface SessionState {
      steps: Map<string, StepData>
      currentStepID: string | null
      context: MatrixEventContext
      finalResponse?: string
      done: boolean
    }

    const sessionsBySessionID = new Map<string, SessionState>()

    // =============================================================================
    // Parse tool calls from CodeMode JS script using AST
    // =============================================================================

    interface ChildToolInfo {
      name: string
      args: string
    }

    type AstNode = { type: string; [key: string]: any }

    async function parseCodeModeTools(code: string): Promise<ChildToolInfo[]> {
      const results: ChildToolInfo[] = []
      const seen = new Set<string>()

      const acorn = await import("acorn")
      const acornWalk = await import("acorn-walk")

      const ast = acorn.parse(code, {
        ecmaVersion: "latest",
        sourceType: "script",
        allowReturnOutsideFunction: true,
        allowAwaitOutsideFunction: true,
        locations: true,
      }) as AstNode

      acornWalk.simple(ast as any, {
        CallExpression(node: AstNode) {
          const toolCall = extractToolCall(node)
          if (!toolCall) return

          const { path, args } = toolCall
          const name = path.join("_")
          if (seen.has(name)) return
          seen.add(name)

          const argsStr = evaluateArgs(args)
          results.push({ name, args: argsStr })
        },
      })

      return results
    }

    function extractToolCall(node: AstNode): { path: string[]; args: AstNode[] } | null {
      const callee = node.callee as AstNode

      if (callee.type !== "MemberExpression") return null
      if (callee.computed) return null

      const prop = callee.property as AstNode
      if (prop.type !== "Identifier") return null
      const toolName = prop.name

      let obj: AstNode = callee.object
      const path: string[] = []

      while (obj.type === "MemberExpression" && !obj.computed) {
        const innerProp = obj.property as AstNode
        if (innerProp.type !== "Identifier") return null
        path.unshift(innerProp.name)
        obj = obj.object
      }

      if (obj.type !== "Identifier" || obj.name !== "tools") return null

      path.unshift(toolName)
      return { path, args: (node.arguments ?? []) as AstNode[] }
    }

    function evaluateArgs(args: AstNode[]): string {
      if (!args || args.length === 0) return ""

      const values: string[] = []
      for (const arg of args) {
        values.push(evaluateExpression(arg))
      }

      return values.join(", ")
    }

    function evaluateExpression(node: AstNode): string {
      switch (node.type) {
        case "Literal":
          return String(node.value)

        case "Identifier": {
          const name = node.name
          if (name === "undefined") return "undefined"
          if (name === "true") return "true"
          if (name === "false") return "false"
          if (name === "null") return "null"
          return name
        }

        case "ObjectExpression": {
          const parts: string[] = []
          for (const prop of node.properties ?? []) {
            if (prop.type === "Property") {
              const key = prop.key.type === "Identifier" ? prop.key.name : String((prop.key as AstNode).value)
              const value = evaluateExpression(prop.value)
              parts.push(`${key}: ${value}`)
            }
          }
          return `{ ${parts.join(", ")} }`
        }

        case "ArrayExpression": {
          const elements = (node.elements ?? []).map((el: AstNode | null) =>
            el ? evaluateExpression(el) : "",
          )
          return `[${elements.join(", ")}]`
        }

        case "TemplateLiteral": {
          let result = "`"
          const quasis = node.quasis ?? []
          const expressions = node.expressions ?? []
          for (let i = 0; i < quasis.length; i++) {
            result += quasis[i]?.value?.raw ?? ""
            if (expressions[i]) {
              result += "${" + evaluateExpression(expressions[i]) + "}"
            }
          }
          result += "`"
          return result
        }

        case "BinaryExpression": {
          const left = evaluateExpression(node.left)
          const right = evaluateExpression(node.right)
          return `${left} ${node.operator} ${right}`
        }

        case "ConditionalExpression": {
          return `${evaluateExpression(node.test)} ? ${evaluateExpression(node.consequent)} : ${evaluateExpression(node.alternate)}`
        }

        case "ArrowFunctionExpression":
        case "FunctionExpression":
          return "function"

        case "CallExpression": {
          if (node.callee?.type === "MemberExpression") {
            const member = node.callee as AstNode
            if (member.object?.type === "Identifier") {
              return `${(member.object as AstNode).name}.${(member.property as AstNode)?.name}(${evaluateArgs(node.arguments ?? [])})`
            }
          }
          return "call"
        }

        case "UnaryExpression": {
          const arg = evaluateExpression(node.argument)
          return `${node.operator}${arg}`
        }

        case "LogicalExpression": {
          return `${evaluateExpression(node.left)} ${node.operator} ${evaluateExpression(node.right)}`
        }

        case "AwaitExpression": {
          return `await ${evaluateExpression(node.argument)}`
        }

        case "SpreadElement": {
          return `...${evaluateExpression(node.argument)}`
        }

        default:
          return `(expr:${node.type})`
      }
    }

    // =============================================================================
    // Event subscription
    // =============================================================================

    void (async () => {
      try {
        for await (const event of ctx.event.subscribe({ signal: eventController.signal })) {
          let eventData: any = event
          if (typeof event === "string") {
            try { eventData = JSON.parse(event) } catch { continue }
          }

          const eventType = eventData?.type || ""
          const sessionId = eventData?.data?.sessionID || ""
          const assistantMsgID = eventData?.data?.assistantMessageID || ""

          const state = sessionsBySessionID.get(sessionId)
          if (state?.done) continue

          if (eventType === "session.step.started") {
            if (!sessionsBySessionID.has(sessionId)) {
              log(`step.started for unknown session ${sessionId}`)
              continue
            }
            const state = sessionsBySessionID.get(sessionId)!
            state.currentStepID = assistantMsgID
            state.steps.set(assistantMsgID, {
              assistantMessageID: assistantMsgID,
              reasoning: "",
              tools: [],
              text: "",
            })
            continue
          }

          if (eventType === "session.reasoning.delta" && assistantMsgID) {
            const state = sessionsBySessionID.get(sessionId)
            const step = state?.steps.get(assistantMsgID)
            if (step) step.reasoning += eventData?.data?.delta || ""
            continue
          }

          if (eventType === "session.reasoning.ended" && assistantMsgID) {
            const state = sessionsBySessionID.get(sessionId)
            const step = state?.steps.get(assistantMsgID)
            if (step) step.reasoning = eventData?.data?.text || ""
            continue
          }

          if (eventType === "session.tool.input.started" && assistantMsgID) {
            const toolID = eventData?.data?.id || ""
            const name = eventData?.data?.name || ""
            const state = sessionsBySessionID.get(sessionId)
            const step = state?.steps.get(assistantMsgID)
            if (step && toolID) {
              step.tools.push({ toolID, name, args: "", result: "", failed: false })
            }
            continue
          }

          if (eventType === "session.tool.input.ended" && assistantMsgID) {
            const toolID = eventData?.data?.id || ""
            const args = eventData?.data?.text || ""
            const state = sessionsBySessionID.get(sessionId)
            const step = state?.steps.get(assistantMsgID)
            if (step && toolID) {
              const tool = step.tools.find(t => t.toolID === toolID)
              if (tool) tool.args = args
            }
            if (toolID && step && args) {
              let parsedArgs: any
              try { parsedArgs = JSON.parse(args) } catch { continue }
              const code = parsedArgs?.code || ""
              if (code) {
                const childTools = await parseCodeModeTools(code)
                for (const child of childTools) {
                  if (!step.tools.find(t => t.name === child.name)) {
                    step.tools.push({
                      toolID: `${toolID}/${child.name}`,
                      name: child.name,
                      args: child.args,
                      result: "",
                      failed: false,
                    })
                  }
                }
              }
            }
            continue
          }

          if (eventType === "session.tool.success" && assistantMsgID) {
            const toolID = eventData?.data?.id || ""
            const content = eventData?.data?.content
            let result = ""
            if (typeof content === "string") {
              result = content
            } else if (Array.isArray(content)) {
              for (const part of content) {
                if (part?.type === "text" && part?.text) result += part.text
              }
            }
            const state = sessionsBySessionID.get(sessionId)
            const step = state?.steps.get(assistantMsgID)
            if (step && toolID) {
              const tool = step.tools.find(t => t.toolID === toolID)
              if (tool) tool.result = result
            }
            continue
          }

          if (eventType === "session.tool.failed" && assistantMsgID) {
            const toolID = eventData?.data?.id || ""
            const state = sessionsBySessionID.get(sessionId)
            const step = state?.steps.get(assistantMsgID)
            if (step && toolID) {
              const tool = step.tools.find(t => t.toolID === toolID)
              if (tool) { tool.failed = true; tool.result = String(eventData?.data?.error || "Unknown error") }
            }
            continue
          }

          if (eventType === "session.text.ended" && assistantMsgID) {
            const state = sessionsBySessionID.get(sessionId)
            if (state?.done) continue
            const step = state?.steps.get(assistantMsgID)
            if (step) {
              step.text = eventData?.data?.text || ""
              if (state) state.finalResponse = step.text
            }
            continue
          }

          if (eventType === "session.step.ended" && sessionId && assistantMsgID) {
            const state = sessionsBySessionID.get(sessionId)

            if (state?.done) continue

            const step = state?.steps.get(assistantMsgID)
            const finish = eventData?.data?.finish || ""

            if (step && state) {
              const msg = formatStepMessage(step)
              await sendMessageToMatrix(state.context, msg)
              log(`Step ${step.tools.length} tool(s), ${step.text.length} chars text → sent to ${state.context.roomId}`)
            }

            if (finish === "stop" && state) {
              state.done = true
              const pending = pendingResponses.get(sessionId)
              if (pending && state.finalResponse) {
                pendingResponses.delete(sessionId)
                pending.resolve(state.finalResponse)
              }
              sessionsBySessionID.delete(sessionId)
            }

            continue
          }

          if (eventType === "session.execution.failed" && sessionId) {
            const pending = pendingResponses.get(sessionId)
            if (pending) {
              pendingResponses.delete(sessionId)
              pending.reject(new Error("Session execution failed"))
            }
            sessionsBySessionID.delete(sessionId)
            continue
          }

          if (eventType === "session.execution.interrupted" && sessionId) {
            const pending = pendingResponses.get(sessionId)
            if (pending) {
              pendingResponses.delete(sessionId)
              pending.reject(new Error("Session execution interrupted"))
            }
            sessionsBySessionID.delete(sessionId)
            continue
          }
        }
      } catch (err) {
        if (String(err).includes("AbortError") || (err as { name?: string }).name === "AbortError") {
          // expected during cleanup
        } else {
          log(`Event subscription error: ${String(err)}`)
        }
      }
    })()

    // =============================================================================
    // Format step into Matrix message
    // =============================================================================

    function formatStepMessage(step: StepData): string {
      const parts: string[] = []

      if (step.reasoning) {
        parts.push(`<details>\n<summary>Thinking</summary>\n\n${step.reasoning}\n\n</details>`)
      }

      if (step.tools.length > 0) {
        const executeTool = step.tools.find(
          (t) => t.name === "execute" && t.toolID.includes("/"),
        )
        const childTools = executeTool
          ? step.tools.filter((t) => t.toolID.startsWith(executeTool.toolID + "/"))
          : []

        if (childTools.length > 0) {
          for (const child of childTools) {
            parts.push(`<details>\n<summary>🔧 ${child.name}</summary>\n\n`)
            parts.push(`<b>Args:</b>\n\`\`\`\n${child.args}\n\`\`\`\n\n`)
            if (child.failed) {
              parts.push(`<b>Failed:</b> ${child.result}\n\n`)
            } else if (child.result) {
              parts.push(`<b>Result:</b>\n\`\`\`\n${child.result}\n\`\`\`\n\n`)
            }
            parts.push(`</details>`)
          }
          if (executeTool?.result) {
            parts.push(`<details>\n<summary>🔧 execute</summary>\n\n`)
            parts.push(`<b>Result:</b>\n\`\`\`\n${executeTool.result}\n\`\`\`\n\n`)
            parts.push(`</details>`)
          }
        } else {
          for (const tool of step.tools) {
            parts.push(`<details>\n<summary>🔧 ${tool.name}</summary>\n\n`)
            parts.push(`<b>Args:</b>\n\`\`\`\n${tool.args}\n\`\`\`\n\n`)
            if (tool.failed) {
              parts.push(`<b>Failed:</b> ${tool.result}\n\n`)
            } else {
              parts.push(`<b>Result:</b>\n\`\`\`\n${tool.result}\n\`\`\`\n\n`)
            }
            parts.push(`</details>`)
          }
        }
      }

      if (step.text) {
        if (parts.length > 0) parts.push("\n---\n")
        parts.push(step.text)
      }

      return parts.join("\n")
    }

    // =============================================================================
    // Send message to Matrix
    // =============================================================================

    async function sendMessageToMatrix(
      context: MatrixEventContext,
      text: string,
    ): Promise<void> {
      try {
        await matrix.sendReply(context, text)
      } catch (err) {
        log(`Failed to send step message: ${String(err)}`)
        await matrix.sendNotice(context, `Error sending: ${String(err).slice(0, 200)}`)
      }
    }

    // Message handler
    matrix.on(async (data: any) => {
      const { context, query, sender, roomId, eventId, timestamp } = data

      if (sessionManager.isRateLimited(sender)) {
        await matrix.sendNotice(context, "Rate limited. Please wait a moment.")
        return
      }

      if (sessionManager.hasActiveQuery(roomId, context.replyThreadRootId || context.eventId)) {
        await matrix.sendNotice(context, "A request is already running in this thread. Please wait.")
        return
      }

      const abortFn = () => { /* placeholder for cancel */ }
      const releaseQuery = sessionManager.markQueryActive(roomId, context.replyThreadRootId || context.eventId, abortFn)

      const threadRootId = context.replyThreadRootId || context.eventId
      const session = sessionManager.getOrCreateSession(roomId, threadRootId, eventId)
      session.isActive = true
      session.messageCount++
      session.inputChars += query.length
      session.lastEventIds.set(context.replyThreadRootId || context.eventId, eventId)
      session.lastActivity = Date.now()

      let opencodeSessionId = session.opencodeSessionId

      if (opencodeSessionId) {
        try {
          await ctx.session.get({ sessionID: opencodeSessionId })
          log(`Using existing OpenCode session ${opencodeSessionId}`)
        } catch (getErr: any) {
          log(`Session ${opencodeSessionId} not found in OpenCode, creating new one`)
          opencodeSessionId = ""
        }
      }

      if (!opencodeSessionId) {
        log(`Creating new OpenCode session for ${roomId}:${threadRootId}`)
        try {
          const createResult = await ctx.session.create({ title: `Matrix: ${roomId.slice(0, 30)}...` })
          opencodeSessionId = createResult?.id || createResult?.data?.id
          log(`Created OpenCode session ${opencodeSessionId} for ${roomId}:${threadRootId}`)
          session.opencodeSessionId = opencodeSessionId
          sessionManager.saveSession(roomId, threadRootId, opencodeSessionId)
          sessionContextMap.set(opencodeSessionId, { roomId, threadRootId, context })
        } catch (createErr: any) {
          log(`Failed to create session: ${String(createErr)}`)
          session.isActive = false
          session.lastActivity = Date.now()
          releaseQuery()
          await matrix.sendNotice(context, "Failed to create session. Check logs.")
          return
        }
      }

      try {
        await ctx.session.prompt({
          sessionID: opencodeSessionId,
          text: query,
        })
        log(`Prompt sent to session ${opencodeSessionId}`)

        sessionsBySessionID.set(opencodeSessionId, {
          steps: new Map(),
          currentStepID: null,
          context,
          finalResponse: undefined,
          done: false,
        })

        const responsePromise = new Promise<string>((resolve, reject) => {
          pendingResponses.set(opencodeSessionId, { resolve, reject })
        })

        const responseText = await responsePromise
        session.outputChars += responseText.length
      } catch (err: any) {
        log(`Error processing message: ${String(err)}`)
        const errMsg = err?.response?.error?.message || String(err)
        await matrix.sendNotice(context, `Error: ${errMsg.slice(0, 200)}`)
      } finally {
        session.isActive = false
        session.lastActivity = Date.now()
        sessionContextMap.delete(opencodeSessionId)
        releaseQuery()
      }
    })

    // Bridge commands
    async function handleBridgeCommand(
      context: { roomId: string; replyThreadRootId?: string; threadRootId?: string; eventId: string },
      cmdName: string,
      sendFn: (text: string) => Promise<void>,
    ): Promise<void> {
      const threadRootId = context.threadRootId || context.replyThreadRootId || context.eventId
      const key = sessionManager.getSessionKey(context.roomId, threadRootId)
      const sess = sessionManager.sessions.get(key)

      switch (cmdName) {
        case "status": {
          if (!sess) {
            await sendFn("No active session.")
            return
          }
          const age = Math.round((Date.now() - sess.lastActivity) / 60000)
          const msg = `Session status:\n- Messages: ${sess.messageCount}\n- Age: ~${age} min ago\n- Input: ~${sess.inputChars} chars\n- Output: ~${sess.outputChars} chars`
          await sendFn(msg)
          break
        }
        case "clear":
        case "reset": {
          sessionManager.removeSession(context.roomId, threadRootId)
          await sendFn("Session cleared. Next message will start a fresh session.")
          break
        }
        case "help":
        case "h": {
          const trigger = options.triggerPatterns?.[0] || "!oc "
          const botName = options.botName || "opencode"
          const msg = [
            `${botName} - OpenCode Matrix Plugin`,
            "",
            "Bridge commands:",
            `- /h or /help - Show this help`,
            `- /status - Show current chat session info`,
            `- /clear or /reset - Delete current session history`,
            "",
            `Usage: ${trigger} <your question>`,
            `Or @${botName} <your question>`,
            `Or reply in a thread`,
          ].join("\n")
          await sendFn(msg)
          break
        }
        default:
          await sendFn(`Unknown command: ${cmdName}. Try /help`)
      }
    }

    // Override the matrix.on handler
    const originalListener = (matrix as any)["listeners"][0]
    ;(matrix as any)["listeners"] = []
    matrix.on(async (data: any) => {
      const { context, query, sender, eventId } = data

      if (query.startsWith("/")) {
        const cmdName = query.slice(1).split(" ")[0].toLowerCase()
        const bridgeCommands = ["status", "clear", "reset", "help", "h"]
        if (bridgeCommands.includes(cmdName)) {
          const sendFn = (text: string) => matrix.sendNotice(context, text)
          await handleBridgeCommand(context, cmdName, sendFn)
          return
        }
      }

      if (originalListener) {
        await originalListener(data)
      }
    })

    // V2 Storage
    if (ctx?.storage) {
      await ctx.storage.set("matrix/plugin_version", "1.0.0")
      await ctx.storage.set("matrix/started_at", new Date().toISOString())
    }

    // Start Matrix client
    await matrix.start()

    log(`Plugin setup completed successfully`)

    cleanup = () => {
      log("Plugin cleaning up...")
      eventController.abort()
      matrix.stop()
    }

    return cleanup
  } catch (err) {
    logError(`Setup error: ${String(err)}`)
    releaseLock()
    return () => {}
  }
}

// =============================================================================
// V2 Setup Function
// =============================================================================

async function v2Setup(ctx: any) {
  // 1. Download native binary BEFORE any matrix imports
  const { ensureNativeBinary } = await import("./bootstrap-native.js")
  ensureNativeBinary()

  // 2. Load logger
  const { log, logError, setAppLog } = await import("./logger.js")
  log("Using V2 path (full context)")

  if (ctx?.app?.log) {
    setAppLog(ctx.app.log.bind(ctx.app))
  }

  const rawStorage = (ctx.options as any)?.storagePath
  const os = require("os")
  const path = require("path")

  const dataDir = rawStorage
    ? path.join(rawStorage, "plugin-data")
    : path.join(os.homedir(), ".local", "share", "opencode-matrix-bot", "plugin-data")

  // 3. Load config
  const { loadConfig } = await import("./config-loader.js")
  const { options } = await loadConfig(ctx.options)

  // 4. Run plugin (handles all matrix imports dynamically)
  return await runPlugin(ctx, options, dataDir, log, logError)
}

// =============================================================================
// Export
// =============================================================================

export default {
  id: "matrix-plugin",
  async setup(ctx: any) {
    try {
      return await v2Setup(ctx)
    } catch (err) {
      const { logError } = await import("./logger.js")
      logError(`V2 setup error: ${String(err)}`)
      return () => {}
    }
  },
}